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Rockall Bank And Trough
The Rockall Trough ( gd, Clais Sgeir Rocail) is a deep-water bathymetric feature to the northwest of Scotland and Ireland, running roughly from southwest to northeast, flanked on the north by the Rockall Plateau and to the south by the Porcupine Seabight. At the northern end, the channel is bounded by the Wyville-Thomson Ridge, named after Charles Wyville Thomson, professor of zoology at the University of Edinburgh and driving force behind the Challenger Expedition. At the southern end, the trough opens into the Porcupine abyssal plain. The Rockall Basin (also known as the Hatton Rockall Basin) is a large (c. 800 km by 150 km) sedimentary basin that lies beneath the trough. Both are named after Rockall, a rocky islet lying 301.4 km west of St Kilda. Features of the Rockall Plateau have been officially named after features of Middle-earth in the fiction of J. R. R. Tolkien, e.g. Eriador Seamount, Rohan Seamount, Gondor Seamount, Fangorn Bank, Edoras Bank, Lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rockall Trough
The Rockall Trough ( gd, Clais Sgeir Rocail) is a deep-water bathymetric feature to the northwest of Scotland and Ireland, running roughly from southwest to northeast, flanked on the north by the Rockall Plateau and to the south by the Porcupine Seabight. At the northern end, the channel is bounded by the Wyville-Thomson Ridge, named after Charles Wyville Thomson, professor of zoology at the University of Edinburgh and driving force behind the Challenger Expedition. At the southern end, the trough opens into the Porcupine abyssal plain. The Rockall Basin (also known as the Hatton Rockall Basin) is a large (c. 800 km by 150 km) sedimentary basin that lies beneath the trough. Both are named after Rockall, a rocky islet lying 301.4 km west of St Kilda. Features of the Rockall Plateau have been officially named after features of Middle-earth in the fiction of J. R. R. Tolkien, e.g. Eriador Seamount, Rohan Seamount, Gondor Seamount, Fangorn Bank, Edoras Bank, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle-earth
Middle-earth is the fictional setting of much of the English writer J. R. R. Tolkien's fantasy. The term is equivalent to the '' Miðgarðr'' of Norse mythology and ''Middangeard'' in Old English works, including ''Beowulf''. Middle-earth is the human-inhabited world, that is, the central continent of the Earth, in Tolkien's imagined mythological past. Tolkien's most widely read works, '' The Hobbit'' and ''The Lord of the Rings'', are set entirely in Middle-earth. "Middle-earth" has also become a short-hand term for Tolkien's legendarium, his large body of fantasy writings, and for the entirety of his fictional world. Middle-earth is the main continent of Earth (Arda) in an imaginary period of the Earth's past, ending with Tolkien's Third Age, about 6,000 years ago. Tolkien's tales of Middle-earth mostly focus on the north-west of the continent. This part of Middle-earth is suggestive of Europe, the north-west of the Old World, with the environs of the Shire reminiscen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesozoic
The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance of archosaurian reptiles, like the dinosaurs; an abundance of conifers and ferns; a hot greenhouse climate; and the tectonic break-up of Pangaea. The Mesozoic is the middle of the three eras since complex life evolved: the Paleozoic, the Mesozoic, and the Cenozoic. The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction whose victims included the non-avian dinosaurs, pterosaurs, mosasaurs, and plesiosaurs. The Mesozoic was a time of significant tectonic, climatic, and evolutionary activity. The era witnessed the gradual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Crust
Continental crust is the layer of igneous, sedimentary, and metamorphic rocks that forms the geological continents and the areas of shallow seabed close to their shores, known as continental shelves. This layer is sometimes called '' sial'' because its bulk composition is richer in aluminium silicates (Al-Si) and has a lower density compared to the oceanic crust, called ''sima'' which is richer in magnesium silicate (Mg-Si) minerals. Changes in seismic wave velocities have shown that at a certain depth (the Conrad discontinuity), there is a reasonably sharp contrast between the more felsic upper continental crust and the lower continental crust, which is more mafic in character. The continental crust consists of various layers, with a bulk composition that is intermediate (SiO2 wt% = 60.6). The average density of continental crust is about , less dense than the ultramafic material that makes up the mantle, which has a density of around . Continental crust is also less dense ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oceanic Crust
Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the rigid uppermost layer of the mantle. The crust and the rigid upper mantle layer together constitute oceanic lithosphere. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick; however, it is denser, having a mean density of about 3.0 grams per cubic centimeter as opposed to continental crust which has a density of about 2.7 grams per cubic centimeter. The crust uppermost is the result of the cooling of magma derived from mantle material below the plate. The magma is injected into the spreading center, which consists mainly of a partly solidified crystal mush derived from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Significant Wave Height
In physical oceanography, the significant wave height (SWH, HTSGW or ''H''s) is defined traditionally as the mean ''wave height'' ( trough to crest) of the highest third of the waves (''H''1/3). Nowadays it is usually defined as four times the standard deviation of the surface elevation – or equivalently as four times the square root of the zeroth-order moment (area) of the '' wave spectrum''. The symbol ''H''m0 is usually used for that latter definition. The significant wave height (Hs) may thus refer to ''H''m0 or ''H''1/3; the difference in magnitude between the two definitions is only a few percent. SWH is used to characterize ''sea state'', including winds and swell. Origin and definition The original definition resulted from work by the oceanographer Walter Munk during World War II. The significant wave height was intended to mathematically express the height estimated by a "trained observer". It is commonly used as a measure of the height of ocean waves. Time domain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RRS Discovery (1962)
RRS ''Discovery'' was a British Royal Research Ship operated by NERC. RRS ''Discovery'' (III) was built in Aberdeen in 1962 and named after Robert Falcon Scott's 1901 ship, RRS ''Discovery''. Until 2006, she was the largest general purpose oceanographic research vessel in use in the United Kingdom. Measuring 90 metres in length, and fitted with a broad range of oceanographic equipment, ''Discovery'' could also accommodate containerized laboratories. She had berths for 28 scientific staff, and the ability to spend up to 45 days at sea. Her last major overhaul was in 1991, when a new superstructure and power plant were installed and her hull lengthened by 10 metres. ''Discovery'' carried out oceanographic and marine biology research from the National Oceanography Centre, Southampton. She operated as part of a fleet maintained by the Natural Environment Research Council (NERC) National Marine Facilities Division (NMFD), along with the larger RRS ''James Cook''. In February 200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isengard
In J. R. R. Tolkien's fantasy writings, Isengard () is a large fortress in Nan Curunír, the Wizard's Vale, in the western part of Middle-earth. In the fantasy world, the name of the fortress is described as a translation of Angrenost, a word in the elvish language, Sindarin, that Tolkien invented. (In fact it is an Old English word meaning "iron enclosure".) In ''The Lord of the Rings'', Orthanc, a tower at the centre of Isengard, is the home of the Wizard Saruman. He had been ensnared by the Dark Lord Sauron through the tower's ''palantír'', a far-seeing crystal ball able to communicate with others like it. Saruman had bred Orcs in Isengard, in imitation of Sauron's forces, to be ready for war with Rohan. The Orcs cut down many trees in the forest of the Ents, who retaliated by destroying Isengard while the army of Orcs was away attacking Rohan at Helm's Deep. However, the Ents were unable to harm the tower of Orthanc. Saruman, isolated in the tower, was visited by some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hillock
A hillock or knoll is a small hill,The Free Dictionary "hillock" entry, retrieved December 18, 2007 usually separated from a larger group of s such as a range. Hillocks are similar in their distribution and size to small s or s. This particular formation occurs often in and |
Lothlórien
In J. R. R. Tolkien's legendarium, Lothlórien or Lórien is the fairest realm of the Elves remaining in Middle-earth during the Third Age. It is ruled by Galadriel and Celeborn from their city of tree-houses at Caras Galadhon. The wood-elves of the realm are known as Galadhrim. The realm, a broad woodland between the Misty Mountains and the River Anduin, is the Elven centre of resistance against the Dark Lord Sauron in ''The Lord of the Rings''. Galadriel had one of the Three Elf-Rings, and used it to keep Sauron from seeing into Lothlórien. The Fellowship of the Ring spent some time in Lothlórien after passing through Moria. Galadriel prepared them for their quest with individual gifts. Scholars have noted that Lothlórien represents variously an Earthly Paradise; an Elfland where time is different, reflecting the traditions of European folklore; and a land of light striving biblically with the darkness of evil. Fictional description Names Tolkien gave the forest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edoras
Rohan is a fictional kingdom of Men in J. R. R. Tolkien's fantasy setting of Middle-earth. Known for its horsemen, the Rohirrim, Rohan provides its ally Gondor with cavalry. Its territory is mainly grassland. The Rohirrim call their land the Mark or the Riddermark, names recalling that of the historical kingdom of Mercia, the region of Western England where Tolkien lived. Tolkien grounded Rohan in elements inspired by Anglo-Saxon tradition, poetry, and linguistics, specifically in its Mercian dialect, in everything but its use of horses. Tolkien used Old English for the kingdom's language and names, pretending that this was in translation of Rohirric. Meduseld, the hall of King Théoden, is modelled on Heorot, the great hall in ''Beowulf''. Within the plot of ''The Lord of the Rings'', Rohan plays a critical role in the action—first against the wizard Saruman in the Battle of the Hornburg, then in the climactic Battle of the Pelennor Fields. There, Théoden leads the Rohi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fangorn
Treebeard, or ''Fangorn'' in Sindarin, is a tree-giant character in J. R. R. Tolkien's ''The Lord of the Rings''. He is an Ent and is said by Gandalf to be "the oldest living thing that still walks beneath the Sun upon this Middle-earth.", book 3, ch. 4 "Treebeard" He lives in the ancient Forest of Fangorn, to which he has given his name. It lies at the southern end of the Misty Mountains. He is described as being about 14 feet (4.5 m) in height, and in appearance similar to a beech or an oak. In ''The Two Towers'', Treebeard meets with Merry Brandybuck and Pippin Took, two Hobbits of the Shire. This meeting proves to have consequences that contribute significantly to the story and enables the events that occur in ''The Return of the King''. Origins In Sindarin, one of Tolkien's Elvish languages, "Fangorn" is a compound of ''fanga'', "beard", and ''orne'', "tree", so it is the equivalent of the English "Treebeard". The Rohirrim (Riders of Rohan) called Fangorn Forest the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
